Alfa Romeo Junior Bolt Pattern, Center Bore & Wheel Offset (2025–2026)
Alfa Romeo Junior wheel fitment: 4x108 bolt pattern, 65.1mm center bore (2025–2026). OE wheel sizes and offsets for every Junior variant we cover (2 guides),
- 4x108bolt pattern (PCD)
- 65.1 mmcenter bore
- M12x1.5 Nutwheel bolt / nut
- 2 guidesmodel years 2025–2026
Alfa Romeo Junior wheel specs by year and trim
| Year | Model / trim | Bolt pattern | Center bore | OE wheel |
|---|---|---|---|---|
| 2026 | Alfa Romeo Junior Sport Speciale | 4x108 | 65.1 mm | 18x7.5J |
| 2025 | Alfa Romeo Junior | 4x108 | 65.1 mm | 17x7.0J |
Factory wheel sizes on the Alfa Romeo Junior
Across the 2 Alfa Romeo Junior trims with a documented factory wheel, the OE diameter is 17-18 inch, width 7-7.5J. A forged wheel that keeps the 4x108 bolt pattern and the 65.1 mm hub bore and matches the factory offset listed on the model page bolts on without spacers or hub rings. Going one inch up in diameter with a lower-profile tyre keeps the rolling circumference inside the usual 1.5% tolerance; every extra 0.5J of width moves the outer lip about 6 mm outward at the same offset, and each 5 mm less offset moves the whole wheel 5 mm outward.
Vehicles With the Same Hub as the Alfa Romeo Junior (4x108, 65.1 mm Bore)
In our database, 121 other vehicle entries from 10 makes use exactly the same 4x108 bolt pattern and 65.1 mm center bore. Factory wheels from these cars bolt on and center on the hub without rings; offset and width still have to be checked.
4x108 is used by 2.6% of the vehicle entries in our database (171 of 6,503); 72.5% of those also use a 65.1 mm center bore.
Hub-Centric Rings for a 65.1 mm Center Bore
A wheel with a center bore larger than 65.1 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 66.1 mm | 66.1 → 65.1 mm |
| 66.6 mm | 66.6 → 65.1 mm |
| 67.1 mm | 67.1 → 65.1 mm |
| 70.1 mm | 70.1 → 65.1 mm |
| 73.1 mm | 73.1 → 65.1 mm |
ANKUSI forged wheels are bored to exactly 65.1 mm for this vehicle, so no ring is needed.
Sources and Last Update
Bolt pattern and center bore were checked against at least two independent fitment references before publication.
This record is part of the open ANKUSI Wheel Fitment Dataset (DOI 10.5281/zenodo.23241521, CC BY 4.0).
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.
FAQ
What is the bolt pattern on a Alfa Romeo Junior?
The Alfa Romeo Junior uses a 4x108 bolt pattern with a 65.1mm center bore across every Junior variant in our database (2 guides, 2025–2026).
What is the Alfa Romeo Junior center bore?
The hub-centric center bore is 65.1 mm. Aftermarket wheels should match this bore or use hub-centric rings so the hub, not the bolts, carries the load.
Do all Alfa Romeo Junior years share the same wheel fitment?
The bolt pattern and center bore are the same across the years we cover, but OE wheel width and offset differ by trim, so check the exact model line before choosing an aftermarket size.
Which forged wheels fit the Alfa Romeo Junior?
Any wheel drilled 4x108 with a 65.1mm hub bore in the offset range shown on the model guide. ANKUSI forges wheels to order for this exact specification, in 14–24 inch diameters, so no adapters or hub rings are needed.